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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3abd652a42f0698cf35d00c5d15ed256a110b02fe7f0597fffa53efbbf73c52' 
  AND token = 'jeSrlIBHYfnDjil1vO9dlxigJ/oeVkk+DKi/Fu53h9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}